This page describes the IBM SMS card "TAH", and is part of the SMS card database.

Function of the card:
SDTRL - 3 way inverter
SDTRL-3 Way Inverter
SDTRL-3 way inverter

Triple 3 Input NAND

Saturated Drift Transistor Resistor Logic (SDTRL) is a form of resistor-transistor logic using faster drift-field transistors.

Part number: 370367

PCB number: 492909

Used in: IBM 1620, IBM 1311 Disk, 7030

Symbol:E, A, O


A I1
B I1
D O3
E O1
F I2
G I2
H I2
K I1
M -12V
N +12VM
P I3
Q I3
R I3
References: Coslet data
IBM 1620 Instructional System Diagrams, p494
IBM 1311 ILD, p136

This page created by Ken Shirriff on Wed Sep 15 18:15:10 2021.

The information on these pages comes from a variety of sources, especially old IBM documents on, as well as information from the IBM 1401 restoration team, especially Tim Coslet's SMS data and Jim Hunt's data. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.